Limit Switches

Limit switches are a contact proximity sensor device that consists of an actuator mechanically linked to a set of output contacts. When an object comes into contact with the actuator, the device operates the contacts to make or break an electrical connection.

Limit Switch Makeup

Limit switches are made up of three key components:
•Actuator Head - The actuator is the part of the switch that makes physical contact with the object. In some limit switches, the actuator is attached to an operating head which translates a rotary, linear, or perpendicular motion to open or close the electrical contacts of the switch.


•Switch Body – The switch body is the component containing the electrical contact mechanism, the contacts within the body open or close the electrical circuit when the actuator is activated.


•Receptacle/Terminals - The component containing the terminal screws or screw/clamp assembly necessary for wiring purposes.



Actuator Types

Limit switches are available with a wide range of actuator types. The type of actuator used can be determined by the mounting position, force required and objects to be detected.
•Rotary Lever - with lever actuators, a cam or plate hits the end of the lever arm which in turn rotates a shaft and operates the contacts in the switch. The rotation may be spring returned (momentary) or maintained.


•Plunger - Plunger types are best where short controlled machine movements are present or where mounting space does not permit a lever type.


•Cat Whisker or Coil Spring – Longer actuators with a coil wire that can be moved/bent in multiple directions. Typically used in conveying applications to count objects as they pass by.


•Forked – Used with maintained contacts, consisting of two roller levers. One roller will trip the switch and when the second is moved to the opposite direction it will reset the switch.

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Description Price Actuator Type Pole and Throw Configuration Normal State Configuration IP Rating Maximum Current Housing Material Maximum AC Voltage Maximum DC Voltage Connection Type Contact Type Series Terminal Type Length Width
RS庫存編號 311-2263
製造零件編號GLCC06A2B
BrandHoneywell
HK$551.06
單位
Adjustable Roller Lever DPST 2NC 2NC IP66 10 A Die Cast Zinc 300V 300V Internal Screw Terminal Contact Block Slow Action GLC 20 mm Conduit 68.5mm 30.5mm
RS庫存編號 470-4396
製造零件編號TV1H 236-11z
BrandSchmersal
HK$397.31
單位
Lever DPDT NO/NC IP67 4 A Thermoplastic 230V 24V - Slow Action - Screw 58.5mm 30mm
RS庫存編號 814-7835
製造零件編號XCKP2145M12
HK$589.20
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Roller Lever DPST NO/NC IP66, IP67 3 A Plastic 250V - M12 Snap Action OsiSense XC 4 Pin 65mm 31mm
RS庫存編號 308-1901
製造零件編號GLDB01A4J
BrandHoneywell
HK$280.51
單位
Adjustable Lever SPDT 1NO/1NC NO/NC IP66 10 A Plastic, Polyester 300V 300V Internal Screw Terminal Contact Block Snap Action GLD PG13.5 Conduit 68.5mm 30.5mm
RS庫存編號 447-3402
製造零件編號XCKP2102P16
HK$510.26
單位
Plunger DP NO/NC IP66, IP67 10 A Plastic 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS庫存編號 435-0343
製造零件編號ZC-Q2255
BrandOmron
HK$758.06
單位
Plunger SPDT NO/NC IP67 10 A - 250V 250V - Snap Action - Screw 69.4mm 70mm
RS庫存編號 609-6625
製造零件編號XCMD2102C12
HK$577.88
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Roller Plunger DP NO/NC IP66, IP67, IP68 1.5 A Zinc Alloy 240V 250V - Snap Action OsiSense XC M12 Connector 50mm 30mm
RS庫存編號 814-7854
製造零件編號XCKD2106N12
HK$1,043.53
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Coil Spring DPST NO/NC IP66, IP67 10 A Zamak® Zinc Alloy 240V - 1/2 NPT Conduit Snap Action OsiSense XC Wire Lead 65mm 31mm
RS庫存編號 447-3878
製造零件編號XCMD2115L1
HK$366.58
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Lever DP NO/NC IP66, IP67, IP68 1.5 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Wire Lead 50mm 30mm
RS庫存編號 186-8481
製造零件編號GLEB01E7B
BrandHoneywell
HK$500.31
單位
Coil Spring SPDT NO/NC IP66 6 A Die Cast Zinc 300V 250V - Snap Action GLE PG13.5 Connector 189mm 65mm
RS庫存編號 308-1838
製造零件編號GLCB01E7B
BrandHoneywell
HK$392.91
單位
Coil Spring SPDT 1NO/1NC NO/NC IP66 10 A Die Cast Zinc 300V 300V Internal Screw Terminal Contact Block Snap Action GLC PG13.5 Conduit 68.5mm 30.5mm
RS庫存編號 315-006
製造零件編號EX-Q
BrandHoneywell
HK$2,324.00
單位
Plunger SPDT NO/NC - 15 A Aluminium 480V 250V - Snap Action - Conduit 122.17mm 3.66in
RS庫存編號 186-8201
製造零件編號GLAC01A1B
BrandHoneywell
HK$823.78
單位
Rotary Lever SPDT NO/NC IP67 6 A Die Cast Zinc 600V 250V - Snap Action GLA 20 mm Conduit 145.8mm 42mm
RS庫存編號 236-013
製造零件編號XCKM106H29
HK$342.99
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Coil Spring DP NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 64mm 63mm
RS庫存編號 757-9159
製造零件編號D4B4116N
BrandOmron
HK$508.92
單位
Roller Lever DPST NO/NC - - Metal - - Screw - D4B-N - 99.5mm 40mm
RS庫存編號 244-749
製造零件編號XCKJ10513H29
HK$1,128.14
單位
Lever SPDT NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 77mm 40mm
RS庫存編號 753-0012
製造零件編號D4E-1A20N
BrandOmron
HK$411.27
單位
Roller Plunger SPDT NO/NC IP67 5 A - 125V - Screw Snap Action - Screw 57mm 32.9mm
RS庫存編號 908-3287
製造零件編號WLCA12-Y-N
BrandOmron
HK$600.44
單位
Roller Lever SPST NO/NC IP67 10 A - 500V 250V M20 Snap Action WL Screw 40mm 53.2mm
RS庫存編號 908-3290
製造零件編號WLCA12-2Y-N
BrandOmron
HK$690.96
單位
Roller Lever SPST NO/NC IP67 10 A - 500V 250V M20 Snap Action WL Screw 40mm 53.2mm
RS庫存編號 808-3107
製造零件編號GLAA01B
BrandHoneywell
HK$685.24
單位
Plunger SPDT NO/NC IP67 10 A Die Cast Zinc 600V 250V 1/2 in NPT Conduit Snap Action GLA Wire Lead 42mm 42mm